iOS - returnFromBackground

returnFromBackground

    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
        NSNotificationCenter.defaultCenter().addObserver(self, selector: "returnFromBackground", name: UIApplicationDidBecomeActiveNotification, object: nil)
    }
    
    override func viewWillDisappear(animated: Bool) {
        super.viewWillDisappear(animated)
        NSNotificationCenter.defaultCenter().removeObserver(self,name: UIApplicationDidBecomeActiveNotification, object: nil)
    }
    
    func returnFromBackground(){
    
    }